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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6159fca98d4c0541c6bd14b273c79e9bc36ba7de703a137055a4194d0d33d694' 
  AND token = 'uJT3EeBy9Ebt3QQ1e5TQ95UQ6GRlmM4ueCspIgcNx1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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