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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe543ddc86db90c1dc1d59396294662ce694e2626f52774a985ccbec81a6fb9' 
  AND token = 'BZr1b3el2lzJEYdASRMG4SYmTTvEf3/pcYg1oa6umnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}