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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e523116cdf4d0a23477fa7fb33c05f8e609566cfd9cbe5e2bca987d598dc4d' 
  AND token = 'OAP/6JU+nOhHscaGLZT1emkCSqW1rhrJfdyAdq9AGXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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