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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc1c6e9dfaa12f174240544dc63cf6ad2a87e0ea7b3d7e2117172421a0d72ca' 
  AND token = 'yTkxHO0Xqy/ieZuGJVbBeCGQkevjGFkHqHanzQkUJSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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