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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da3abddb4267769c93f88a20bd78bcc3c60167c05c53875c8e20726e677e7fb' 
  AND token = 'S4P66YixvPiHYkpU+XfHO/4eIekwabJpbb2oH4VVtTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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