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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ca7f9a834ab2d397f78c7c34410f77415d306ddcab50d8b0a184bf27086975' 
  AND token = '5aMv5iB1SUg2bhbGiRaOcuk4R87gOjEpDwRwgd1pNwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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