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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6167e977f4e496e0da4eb03dc0c71ad6012aa598c08c3c1002002d5b6cf2e0' 
  AND token = '1HAL4AQFqhUDN4GvQYvdLuQGib8pUAsK//kD2ZMC4Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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