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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ab3d783bbdee156e2d6a72bedf64acb0a7726f4b8a1267ceab610ff16be04e' 
  AND token = '0OxBJF/aDbaczbqsv/k7P9/OIKMdv7XWVjx9L/M/HlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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