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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38727f91cf1342d7f9b2f703645e589609395bd771e9bc64300902937748bab5' 
  AND token = 'C2UuVfmEblwH0Z3RrFQORobDTemmcgzHi+C8KITKkus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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