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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db0eb951e2df84f09357ebab3694e5593bee1d39fc0262ca2736a796e5de8f6' 
  AND token = 'dPiwH0vn5Aybo6pCFb5144GVUfb7ddSsPnp47AyIXbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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