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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8cc02bbc64734dfacb02c749087080536fbfb1b7889f096a3f08dc9d13bf20b' 
  AND token = '76gjQf9rrRyf+B+CXF8VeyQJ7FeghxG8LcPYk3J1uCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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