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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84209c5b0b5650492b6ac9dc5eabe5a97df829d182203fe28c4485493c37a137' 
  AND token = 'EfyGKkHXdNpKZptyfQ36SJW7cRcGA/zlBqbQkFO5H7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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