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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c761570cd47ec68afc6b891ac52b6abe3bf212aea986f0fcf383565bfb45a0' 
  AND token = 'qnCvsaBCNU3QhjmZYizuSR5I5mT953b09j4/QZB4IWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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