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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c13ba85316f4851591cd0e3e9f56de028533257ea811931c29868f403d663b3' 
  AND token = 's91JXBokpniZMTmp18Zd7lk3mGdqeWOwVJ20Fz3Z/dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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