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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b425b04db15dd00b6d864e7045ba8831cd957b2d15e48f5ddfd07af4864493' 
  AND token = 'WyEs9G5WCEICgnq0B4i538apitjKhlza6N4tbpSQNb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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