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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e88878c63b25ce17ceb1fb668bca43bbaa72d16ff55afa1c4aefd75408504cc' 
  AND token = '/H7cp/OQWeWXSpA4HMbpVofIotWPMbFSFGhFBFa+auQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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