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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88061d53a205069b7d67fa4586cdb40a692d21700a1289309f94c850728ba69c' 
  AND token = 'EqzYcZ2vW229uQf1BBz0ABqosfeGvCC4LeiJCLXOnYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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