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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50098d4926e375a97558cde93ef458418d4fbb068b0c0e1aa2c2aed4a3c5fa9' 
  AND token = '5hziEfOwkhMN+YTjJDH92kiarhS/NwifCy76Y0yJde0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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