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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e3f67ae8a18c5a5c66fc2558da15fa12e511bab976b393e553c6ccea58b1ad' 
  AND token = 'I2GitixJyjN6bay1VOaLlSwNq9/xneTaybzxaMCKtRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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