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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e984a14074f6ac82455d1e7e9b531d3b4250b1e03ee0d75df28095c1bdfc38c1' 
  AND token = 'XSiz4d8ZPrrt3+Z8hHCLG2CCtrCA9b4Wwfv0Mpcg/qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00244

JSON explain

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