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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf258c80dff3dbda614ae42ab030e7f873dbb10925171b5c4bc64bc52c7056d' 
  AND token = 'mmf3loDFO6ZyBVZQIC0o5y5XAuti7ZFm2GL21WHtFo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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