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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00840e0b627dc5e63978325edd88a5cf930140ef3ca89ffb36692210fc50d86e' 
  AND token = 'EQvHkwbCwqfh+K76bN7qyh7SyMlctHHg1sZdlVNKOus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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