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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6103bd8b6c3db97485bcdcae173017cf99028a3df4cea2e9f75ee51520dce569' 
  AND token = 'BLq5vc7W4UCCxwMEbCG2K74SHXZptqAP3PB8EYZaZ0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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