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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4bedfcaad2dc2143a8e0c50c591f4adda1c76cae0c85722b0cc2453a80fd75a' 
  AND token = 'k710FrBf50OFuiSQISY+PLcWpnYn/BlLFpigtQuusFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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