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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947c4230ffb686e0a90a231b6c164c21927e0bc1a170e1f3b990a574dbdaa0be' 
  AND token = 'xInOi1oQ8g31R/xXbpFIYHVyYE0b0TPjUxVzdV6GRNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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