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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8e656ddbbf2637c2cdffbc99369150179654adaee82ecea282ac70a2e44955' 
  AND token = 'Pxz8yrROrzTRmdL//wXe9ba04J0Gy2/lpjsU3eVuNOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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