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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9046fd6c0751b758ecce17a5cfc5d81916db24fec6b67ed263489f5d82c8a66' 
  AND token = 'PPIHH06W1Yi8wUt1kflwYtKg/4XY4JLBN9twYeurT/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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