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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee28693411ca58e0e9f3cac34ff5ca85d777b4cec68760ef159eb4ac7069a93' 
  AND token = 'RLiuOsbe0NNETYthrfCBfcilZPc6SOoJNACPrFM17Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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