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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb44b0a42667294c931b542d96e2d9c041964148c37504f8e636b71d9e36e11c' 
  AND token = '1adaTkHHLsky9PSdlr6QqqqImucwZYVo7W2zoyFJp8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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