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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73637884e8b9271a34ccf5c0b1be3e6c873d253580797c89ed95088a94cd558' 
  AND token = 'NtkpIxs2NGI5t7oPKSIwu/lA/FYdKzKpA1FJAoPwpS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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