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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82e67d946867b2dcf294b09e3bf1f7e09c75f89450e7ea847ef79c95880c89a' 
  AND token = 'cCcJRHF8kEkpDvziyVQmn2pXWQa22Aft5MMH2MkA4LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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