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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae046b353a49a5a145d1e1dd2f82acfcd53021347795f8f73f2efdf7a27250d8' 
  AND token = 'qKyjmVSbtUyUdy5WkstC4905dzHjx0rQ8Kd71xbl0dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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