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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef66fd42868687b011dd6b48f7d48a0220fdf93759009a95f358f51b0cce2dc' 
  AND token = 'QXfwBiA57qSAIPl2dQ6IyASjqJw2/O9bOA3y/mVLI9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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