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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63791ea1716faaa9154575c4f02ca2aae925a2171f1f41e22dc49fcfccf8b5f8' 
  AND token = 'QKbdGP2t0bPca2emWoyvpZsXI7uqtQT1t7Kmxkj9Kd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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