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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02e24055076d4c3186d2b2bca84a05dab992ff0b96c4288f893399185dcb73c' 
  AND token = 'VGNiJODdJkf95E+moK1/fysQVBIUR0/5+xeMkNucPm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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