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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61a86a32d4ef1321f2ac4441a12294f0c494894bdfd3a0e441e08f2dd43894e' 
  AND token = 'hh4oi9T7+4MuR7i37N7rzKqE4tngUrCFv/5Q26OGARM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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