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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc79c8de40bf79964310f48f988c4daec94d75bf75d17e80948cd64b0d82799' 
  AND token = 'kEaCswk3fxOeWcdvsyaeDiCCgWfXHGUh6fhrkf491t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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