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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526cd3a4b023b10ff85a9ca1972bfe40a3536bf76caf7a72b768f5daf9d15a63' 
  AND token = 'EoXikMamLoET8xmqvEndKG2Nw2GcNu4fioIDeHO9DlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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