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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd5ea94d9f3080cbc3a87fea3316e7d018d89254bf124b869a184868ddc501e' 
  AND token = '0ap+SMVTa58bDDcXCjKH+1muRAdoYYPzjpoa/OrtAFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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