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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ec4b082848fb90c1e6d5f9d00a6507b79679ddec05b364fee13322d26e295d' 
  AND token = 'NHIX3xuo3VH/1XWjT+KXErQ3izL5Y4FjLtVkSxDGXCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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