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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4250b3f94d4a16eb2e4e2ecc28dd2614f9ac0e9acb497bb75564fd84352a92' 
  AND token = 'RkE06jGofBW6T7YbWLAzey3GLpFA+eaOC1xVPHRjxcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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