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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5240d48593174b6d958fbcdb8fc70f6c85bf348617a8dd98a0fcc341c322ea' 
  AND token = 'NY6dHD17M948xvfqCbPshc+lnWG6gX+poDX+3p2GL0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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