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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3b9ee955940a42adc175c68dc29902ac5afe8ff34e56f84d714531cfbf4039' 
  AND token = 'y+C67Es2raLo4RlKCRX1H3BYB3Li/kCM0/L9gElB3T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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