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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4e57292ff8b09ed885a0066a6f0c3b78a32aece3394dda69afc1442f6f3100' 
  AND token = 'NUx9MC7opNHoqGov9frbiUji+/SIje9c9n4XpqvAThA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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