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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982c357b004cb7c30f8cbf1bdfe0810f668d65e406e5d8fb27159afd8ba73aa9' 
  AND token = 'j6a9DjzUijciPna4L3ub9A36XsT/hf9TnQp36TZiGEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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