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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9732e9a5bc44745eeedbdb1eceb140c9defe7f3bb96d78fec3c004d63dbef069' 
  AND token = 'ZhcGTeHd9ffH4dk8X1Uz/hK5bNuAPfEQjZocF3FN3UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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