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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c0eba6848dadb5f2c1d8519ed94a2ea6f12708cf7df0c7722be0b5fe5f8eb9' 
  AND token = 'erWayjTYiAO/Bi/8rF0dFDZimKBWwg/BstkN0ziM/oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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