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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9867a0af92e9c0668e15e624db435a9d87fcf3419af8d10bd6bb7d5a723070' 
  AND token = 'HNDehXnhghrg+HhQADlMEnHDqMh1lW54x+FZoeTu/gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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