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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93b2b2d8b76af6f637d0a348017613dd14c2ffe725087d57e129696bd3679c6' 
  AND token = 'zDaIFLaxV10WKbAj62dSk4MxhZP2LabaWfliqakvYTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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