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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6923fd6a16193b38e51b5c7565de6e75e36be3c04452de239331243c43be3a53' 
  AND token = 'V+ea0M00/fhfYKQxIoddAGS+xWqJ54jO4itkpB3n0BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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