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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f03ae7684e3e745d62dddd7553d8e1e08398f18f5f24c51bcab9337ad42d80' 
  AND token = '7mJfY0+Fl3vVtQ0QP0dojQe+KSX6oO8ETn26aH6U+fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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