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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31d95d39583c715e39c8fad8c446764d4803215af5a106c0f6ce614796e734d' 
  AND token = 'TQRPYl5kMHWUrVXae4y0FuW7yuDYwY8+tLSA/SSTibA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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