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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1894dfbc0cf469beeb93b258b4ee52dbb0e24c9d74c7a020fdeaece501ca3c03' 
  AND token = '0FBNpOXF0f5r4/SnZ7FuUb8633hStHPNk7C4Q7sVFW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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