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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3d99ec472c139583cc81844e25af8f2e29896cc903ffb5f401447a03549d7b' 
  AND token = 'rBSQ9BIlttwlrZjN5KWm1gTYzQVfhKQTex1Y3Wpocq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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