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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92808c8bea7dbc20c5fd69768dd6e8c25b267492975e3aede3712127ed033bd' 
  AND token = 'iIPfCBJoxjo5Y3IyEcQdnLR3gQT1sq2du4KJ4qh9WZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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