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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd348c6a2de7ce9e43cf2f89aad66ff79cf104990632e4737b2afca06f3beb8cd' 
  AND token = '7lug1c0nk9naxQPamfobf+fHF3ghGos9Ww4aqNmaVT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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