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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b9cf4ae2c70ccfc4f81d8d44dfa86e5c4fc21c3c0fb89092ab68a164972148' 
  AND token = 'BwJ0NCP8YoOALKdrY1a/Z3m+aVs2mDSl8kb508wJl64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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